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Finding the Fourth Proportional to 90,011.71, 135,036.70 and 30,831.49

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Solution

The fourth proportional to 90,011.71, 135,036.70 and 30,831.49 is: 46,253.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,011.71 : 135,036.70 = 30,831.49 : x
  2. Step 2: Convert to fraction form
    90,011.71/135,036.70 = 30,831.49/x
  3. Step 3: Cross multiply
    90,011.71x = 135,036.70 × 30,831.49
  4. Step 4: Simplify right side
    90,011.71x = 4,163,382,665.68
  5. Step 5: Solve for x
    x = 4,163,382,665.68/90,011.71
  6. Step 6: Final answer
    x = 46,253.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.